WASHINGTON (AP) - Campaign workers for District of Columbia Mayor Vincent Gray tell The Associated Press that day laborers who worked at polling places on Gray's behalf in 2010 were routinely paid $100 in cash - twice the legal limit.

In addition, an AP review has found that the cash payments to poll workers were later disguised on campaign finance reports as "consulting fees" to campaign staffers and volunteers. The campaign volunteers say they were not paid consultants.

Cash payments to poll workers are limited to $50 in the district under a law intended to ensure transparency.

Gray's campaign is the subject of a long-running federal investigation, and three campaign aides have pleaded guilty to financial violations. But there's no indication that authorities are investigating the payments to poll workers.